staging: clocking-wizard: prefer 'help' in Kconfig

Fixes the checkpatch warning:

WARNING: prefer 'help' over '---help---' for new help texts
+config COMMON_CLK_XLNX_CLKWZRD
Signed-off-by: Kyle Buzby <kyle.buzby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/clocking-wizard/Kconfig

@@ -5,5 +5,5 @@
 config COMMON_CLK_XLNX_CLKWZRD
 	tristate "Xilinx Clocking Wizard"
 	depends on COMMON_CLK && OF
-	---help---
+	help
 	  Support for the Xilinx Clocking Wizard IP core clock generator.